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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831d68c3a70ac6258a9735903aa5dfdb0522dc72a2274ea8520ee63acd274b64' 
  AND token = 'pkEfEVYKYLPfJxvV7Pc5WMiiY2jpJlcPMSc1fTFrvec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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