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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e11cea575d0e855aae5cad4f6817c5f63ca849212419f46f5333c7213fc04029' 
  AND token = 'KXItJUb8BRRNz46T/33PUm5PByuhsLV3iRAU2wXglIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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