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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b3da11e618fb6e0e5e7c0852c29863be7d433944b7065f6a2e491bc8ef5826' 
  AND token = '227mhauIy4CV4ljIM87JCYdZRJc3wkHkGwmRhfEZvt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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