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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed8920cdb7ef7f2db05b2c60a6713ccd0725125cb435b078bc7a46308058040c' 
  AND token = 'CITW+sIqEU5ngeFlqDky8m1WTUtFAJkKSfqHp60iigs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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