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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '218f06c32d6e1e96ac8f862a87742e165d4c77c310fd5260371ccc855d18d3af' 
  AND token = 'ANkPk4pSUHOD17ggSjcIh3PLOlYk83EiNlQ+rjW5q8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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