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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a23838f6fd08fa0b3cf59778b42c46c25f4973c7839f96bdba95343a593fc6' 
  AND token = 'SO5U4C6u7HAhKHCfCQ/bR4OamLz+ATXtSWhK/EFlj9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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