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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a879c7df06c6497d900778216cb888daffffa37223db041aa682d33fc82b01' 
  AND token = 'lQBNDkJ51j0Boj1mzWkZ2DsziNRCYpCO2M//OUfus7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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