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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c184c390b33ca2d4a0ec602e4a09535720bee4f34e83d107027367b42077ff4' 
  AND token = 'x6cbuxhpYapaLv+JY0m0aSBqsX5QamLcQ+5g98N9BeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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