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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '539552f0b112bb81454d36c642b0257c288080a4b1d878c8401018a815cdeb97' 
  AND token = 'cyca4YMaToFhQ/hnDCUnQg3jvjArXdopi1Pox+dVFD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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