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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce5e36b48a765095c3f7859f0f42c0af4cbd605be08fec785c5e82d74ddfa62c' 
  AND token = 'fXmGAMdJbwyuA4kR/h6QN90FJVE4Xn791y4hAuaV7kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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