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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb17c5676e6f72287ce7f55dd3b07fde92708e11cb9403a845af5724fafac0aa' 
  AND token = 'w6LYkOUqAfqZFRWYqX186Nv1NnM3kaOXKxCOHO7m9so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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