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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d37384c1d5caadcde57546f0e98b8e1854f5e88f80d54ca2679eb71bf1ea8ee' 
  AND token = 'I9Ml3xUa7gtEIxV5ZC8vMWz/+da+YpwAGuhOYbfsrSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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