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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a300e4476a5eb76413cdcb495a33a13a152198046e20084d2496c1120ae0a46' 
  AND token = 'jOIw0o4njcGSK9RFDZTZNY5nIed/gu2sbGpvwqdjb9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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