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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '635d974c6768b5c535a360679a9f7edb77790c29324091f851097ec4590b276f' 
  AND token = '4RMq/Qcc/gyh+6DjUudgzcg6SBJnygdmv6gr6hRhAmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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