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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21596fe632721d6225b350b40dfc1589fc3f1705787bae0d5830bf06d02c5ad5' 
  AND token = 'xaO0SZJsFhNDGxKP83/Vcdk0io11SeOXcRIhRrFgCC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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