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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b6422d64a5c52c1d5a74f5e3ad25eb67b1a413d94f79f2f527fcc0bdc7dda8' 
  AND token = 'WgKVmw5vkjcMVUXGfzaszXWfH5/I77etmIazMBnckn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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