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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789e32de54abbf7011e584ba2866ce0e5f8ce787448eeb265afca40c11983805' 
  AND token = 'jsfCwPpJLgVASat3huclrj9Cl+MuzWC5S12PXjljDiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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