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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a28ff5572a467c932799438f2068b481f9f3823d4ff97b25b11ec02800161d' 
  AND token = 'm/WCe3XEaBsiq1b3isNMFpQdVJt1XUr1Wlrf0x8H4kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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