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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6173b12f32e45d39b2094da1d685a110e8ddb2832a8a664547bc9154a9d0e64b' 
  AND token = 'C8VsiOm0jXIKQKfVs97wmbZ9QRifZOe7ap8wYjRS26c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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