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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdcada09b0ce955ad033eeea369e1ee18e3aa436fb657291b18fd4b1c2460b4a' 
  AND token = 'UerHn2mNrASoASiyYnI6CaGaZc1RKX/JLzlF5HYY2bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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