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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf98105ee664c614e3d3474b0cbb0beceeacabd1b6d876cc4fc7fc688b1d9a8' 
  AND token = 'A1T1poK39+wOJewTWCuDOCtnZK4tWvERs5sTli5WIxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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