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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '025d4e34b5805c28ec7d602f19ff67ad98206d03c9df68f63c257f544633a17d' 
  AND token = 'f7Rhu0+6OdYwczHz2J3io+ytlgRY0bA+WDYF+USpsZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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