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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d4a0a8ae60163f9658a0267d506be70e246b6300c6f4497bdb38034a81827a' 
  AND token = 'mEw7BEsto4NBdR5gPAdwBk2QSMQCh39ljB/rQy4zr7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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