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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0503a1ecbc984f8faf2e1378582f3a8fe1592c21f04678c984dfd25c97d11bd7' 
  AND token = 'QM2HeVjTdgN4lJiwLXLEdJLz1Xpob83+742PDwNKd68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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