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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2479539a9c0488f1a087516a8254191b6a08aa737093e8bae53634530a045acb' 
  AND token = 'JWQg/OMMX9ecG3X2cipYmMMIv/RmgI/yfuci/FkRgKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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