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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48e88929c7bae3d8bce93d2858cc11a3cdce7fe15120841155f9e9ce1e6bd755' 
  AND token = 'VED0Jd7gay+DyqOy/R4FCBg0E1/8vUcxWowA2sNoFmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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