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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef0cec562fa5ba2eb0a07cd78e487611d8fcd480f6ebf089cc3135960382416e' 
  AND token = '0Jl9zEKx58mFg54nDDU/yaeMDE5JhTqKAAjExgJZIuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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