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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '917c9ef34bb6deca85e34bfc52203b639d77a8cbcfd6d1a67ff8ab46f450c03c' 
  AND token = 'qzbQetF1Quo9pJ/46nbUBV3C4RvYHfaRsMDuLl6zho4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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