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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c5822ce6704e6eea0d387e52465a88bd1d91d1a75d7bcc9ef80ed65343f9d29' 
  AND token = 'fpiRP76hFh1o9gMN50DKTFDHuW3FRPCcxQcn8A7I3Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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