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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790e5b4520af1f759101b45138751a545cdb05913b4cee460103a179e9b82dcd' 
  AND token = '9HZcktcS3QM5girXEXAEYWy+3Ju2Lk/pZynRHLQhjsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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