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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '706247c8166ef14392558dee51be2e0da914f4c9c5e6b82acae4f68c2ad7f4d3' 
  AND token = 'oEbaMfRNxDHFpB/L+6zZMki+eLZUiTX1j6PG0oBBDDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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