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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '245c23956448dda868a1eb8999f00ca7aebc3f100f57c9e186f1836965b72f49' 
  AND token = '+YGWopL6Cjan6WtlVCVIVaPuUb2Dl2zpZonooh2b78k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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