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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcf03b3a67674809e289514afd03c5902733f4f17b8340783300343a3d0aa78a' 
  AND token = 'zhI1c9OE8TjHh0m0qGWBoERM9NDvUwaE+a7q5YCKGWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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