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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803a44c825aa1187768a167ff75b51e453827bce786a2069d7d011ffb4b10e74' 
  AND token = 'hSy6jUfpYK7P7rVWORAEEfMz9OElbHJk4QWS/PIt+Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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