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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2093b61fd2a375275a8e195e65ca06a3ec4a4026a155de461fe78d18223c7410' 
  AND token = 'D43QKNUlGoKDfBQB057I9+SqB8pcM+4Wa3bllb3EA7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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