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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361376e21319609a03702c9eb0940f47519fbecc58f0a365d43be371417083dc' 
  AND token = '6wRh+jL602O3T7VRFQg8iHIr5bWbcE7hYy8u9H8A6H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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