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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1808974e43c7164c4f68ab752692923c72bfe0d1b17130cc2567d017bf55846' 
  AND token = 'o60oxDj4H3nnzPrmtO0u48uVuSsaBCBaFcC9HVHHPN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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