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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e905c67f081f66ab4e89f05c9670ef19d1365b4fca55e80a9956b1e36145b92' 
  AND token = 'B6LYavS++dlt5D5K+UZ+mzp52X22dlmYV8NN09mFfTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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