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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac12647305e2829f3c3e852153347eabe84731f5e4e6a319e29d450933b6e16' 
  AND token = 'd2GyouxkRrjzA5ZffXRedQ2nTuQJhU9/s/e4VZC3fas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}