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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cec694fe1be012f40381350cc6f50c7585b205dbee17fe2aa7971413fea26c2' 
  AND token = 'R3zkG0p9DEaT6IBMj2bEfjeQ+ZVRwu0+3Fhfzha9QnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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