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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0838fbc1eaf7bb633acb1657b9a10898f62ae2717d312f8e6dabe1a20a7ab59a' 
  AND token = 'qKyZi7LfaGAgtybSryBKtvkhoHlPq1mxstjoYafsRFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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