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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028549e8ad261a638b7fe8df61ace7416fdd92dbca9686abd0472374b7561938' 
  AND token = 'Bk2QVLfC8VAaeOXTkiV+E5pRpV7nYv/iJ9TSKoKpabg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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