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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c0bd7b0bd9232ed87d57422438c914a4e7478e5bc1d51fbbbc9cd44c98e4f0' 
  AND token = 'NOHWoBV0K0U1CNJ6fXhgpEthR5IJkzlXy7iMZ4is61Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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