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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a637ca32c643e58d85fc5f9d209e822d341e336a9fd4cb3a3a3894796c3ea50' 
  AND token = 'kywp5lvt7XFu5lkQfmzCs+wcwljSfmvBylL8ro9CUqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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