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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc70036c072aac3f8fd7b49fcb517332ca98a0e3897e105305508d335db912e7' 
  AND token = 'UgDgS19o0vCO9kWAgZNn2CsfeR40aqp1Omf9+7OG2Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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