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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b5e2e3eebb39f7efafdca2b09f927da154cba1f6267eb3587ecd6b55a11dc3' 
  AND token = '+lm1duRyJl0RJiHG35kZMj12l6g6FN+3Fg4AGuqEtQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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