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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa69f881be15e7d4256c8d8454fc5a65c9d20930c909209e89384b4f3386826' 
  AND token = 'Me2PkmpEYefm07Sr7gB2esk3ElhR09/dAxaYPMCab/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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