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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56744e895d5ef847c39a160eea9b3023b0cd0f96934d02e723aaa2a17a0ab1de' 
  AND token = 'HwRzhAgxDONUbe5enV+9k/qd7A4gzcUOgjNjKyy/1WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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