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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea61e44f45c529f74a82bc09f65b46dc638b732f7f411182097e9a435a35f21' 
  AND token = 'z90e4N1aSwX0aYCySkL5iWoriy6v9zKXQ3tgTXHIEPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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