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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc7f3ee044f6359f25690d9f9920303aed52b5e9e7ac88fa7380d311302bd10' 
  AND token = '2jlguxc2Zt1GvpDX5yt5h04lQBMdDArHD5+wEgUMoHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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