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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7373ade6090a09129e6f5e04834c4d689ab065a75a2caf66e6eabf3b1f0a4fd' 
  AND token = '3MGwPdAhZ+6FJeKz/xqZfyo5DvAaJFEcIm3/Mr7yzlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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