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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4755c2d5de6f280d4f7ce072a4d63d483ce0d9dacb6121e3b745fd0fdb498b7f' 
  AND token = '5r2BbofKKpDI24e7jW1cIWj1pbqA50OR+G5rCYZsDYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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