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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9568ea614655a1a68a9755708835667de666cc86f06037608a7b21a56bdb6182' 
  AND token = '+rw/P0Ein5e0P5v2WWU4bJf+KzKsj/Y2kt0JaaoByho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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