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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fd39bebe59101d1b9af35aeeed40437d4574f0e1f8aaec3150cb0b9a994e230' 
  AND token = 'sseZvDq6kkmDcqNwdDY1gXikEi+HC09JrY3w4e61eBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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