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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '363f1a228ceb78ebd0a181c7379b87c85723c4affb9329ae935e416de796871e' 
  AND token = 'hOMvmon4cpNiU4qi+i/mow6g2aQ3sCbL91f+UgiU2dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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