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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e8972d3474221dfe18028c1ae5602b65206e4834fdcfd6df5ada8938408b3e6' 
  AND token = 'MJeNt7MV4YkXlaXnbKsmsSOL7xX6ym6FR4mukJy6Puw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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